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Testinf the combustion chamber for tightness > < Installing

Octavia Mk2

Testing the compression
Testing the compression
Special tools and workshop equipment required
t  Spark plug wrench, e.g. -3122 B-
t  Adapter, e.g. -V.A.G 1381/5A-
t  Compression tester, e.g. -V.A.G 1763-
Test condition
l  Engine oil temperature must be at least 30°C.
l  Voltage supply o.k.
Test sequence
–  Remove the ignition coils with the power output stages and the spark plugs → Chapter.
–  Open lid of fuse carrier in the engine compartment and unplug the fuse for Motronic current supply relay -J271- → Current flow diagrams and Fitting locations.
  Note
Removing the fuse interrupts the voltage supply of the injection valves and the ignitions coils.
–  Check the compression pressure with the compression tester -V.A.G 1763- and the adapter -V.A.G 1381/5A-.
  Note
Use of tester → Operating Instructions.
–  Arrange for the starter to be actuated by a second mechanic.
–  Operate starter until the tester no longer indicates a pressure rise.
Compression readings:
   
Engine identification charactersnewWear limitmx. difference
between the cylinders
BLR, BLX, BVX, BVY1.3…1.6 MPa0.8 MPa0.3 MPa
 (13.0…16.0 bar)(8.0 bar)(3.0 bar)
BLY, BVZ, BWA1.1…1.4 MPa0.7 MPa0.3 MPa
 (11.0…14.0 bar)(7.0 bar)(3.0 bar)

If the specified values are not reached, test the combustion chamber for tightness → Chapter.
Installation occurs in reverse order to removal. Pay attention to the following:
–  Install spark plugs → Chapter.
–  Delete the contents of the fault memory for the engine control unit at the end of the work as error messages were stored due to disconnecting the plugs → Vehicle diagnosis, testing and information system VAS 5051.
  Note
After deleting the fault memory of the engine control unit the readiness code must be re-generated.
   

Testinf the combustion chamber for tightness > < Installing